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311 lines
9.3 KiB
C
311 lines
9.3 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (C) 2016 Gvozden Nešković. All rights reserved.
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*/
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#include <sys/vdev_raidz_impl.h>
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/*
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* Provide native CPU scalar routines.
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* Support 32bit and 64bit CPUs.
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*/
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#if ((~(0x0ULL)) >> 24) == 0xffULL
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#define ELEM_SIZE 4
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typedef uint32_t iv_t;
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#elif ((~(0x0ULL)) >> 56) == 0xffULL
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#define ELEM_SIZE 8
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typedef uint64_t iv_t;
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#endif
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/*
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* Vector type used in scalar implementation
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*
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* The union is expected to be of native CPU register size. Since addition
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* uses XOR operation, it can be performed an all byte elements at once.
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* Multiplication requires per byte access.
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*/
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typedef union {
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iv_t e;
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uint8_t b[ELEM_SIZE];
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} v_t;
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/*
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* Precomputed lookup tables for multiplication by a constant
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*
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* Reconstruction path requires multiplication by a constant factors. Instead of
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* performing two step lookup (log & exp tables), a direct lookup can be used
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* instead. Multiplication of element 'a' by a constant 'c' is obtained as:
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*
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* r = vdev_raidz_mul_lt[c_log][a];
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*
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* where c_log = vdev_raidz_log2[c]. Log of coefficient factors is used because
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* they are faster to obtain while solving the syndrome equations.
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*
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* PERFORMANCE NOTE:
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* Even though the complete lookup table uses 64kiB, only relatively small
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* portion of it is used at the same time. Following shows number of accessed
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* bytes for different cases:
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* - 1 failed disk: 256B (1 mul. coefficient)
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* - 2 failed disks: 512B (2 mul. coefficients)
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* - 3 failed disks: 1536B (6 mul. coefficients)
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*
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* Size of actually accessed lookup table regions is only larger for
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* reconstruction of 3 failed disks, when compared to traditional log/exp
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* method. But since the result is obtained in one lookup step performance is
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* doubled.
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*/
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static uint8_t vdev_raidz_mul_lt[256][256] __attribute__((aligned(256)));
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static void
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raidz_init_scalar(void)
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{
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int c, i;
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for (c = 0; c < 256; c++)
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for (i = 0; i < 256; i++)
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vdev_raidz_mul_lt[c][i] = gf_mul(c, i);
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}
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#define PREFETCHNTA(ptr, offset) {}
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#define PREFETCH(ptr, offset) {}
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#define XOR_ACC(src, acc) acc.e ^= ((v_t *)src)[0].e
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#define XOR(src, acc) acc.e ^= src.e
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#define ZERO(acc) acc.e = 0
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#define COPY(src, dst) dst = src
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#define LOAD(src, val) val = ((v_t *)src)[0]
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#define STORE(dst, val) ((v_t *)dst)[0] = val
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/*
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* Constants used for optimized multiplication by 2.
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*/
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static const struct {
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iv_t mod;
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iv_t mask;
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iv_t msb;
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} scalar_mul2_consts = {
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#if ELEM_SIZE == 8
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.mod = 0x1d1d1d1d1d1d1d1dULL,
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.mask = 0xfefefefefefefefeULL,
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.msb = 0x8080808080808080ULL,
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#else
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.mod = 0x1d1d1d1dULL,
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.mask = 0xfefefefeULL,
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.msb = 0x80808080ULL,
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#endif
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};
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#define MUL2_SETUP() {}
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#define MUL2(a) \
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{ \
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iv_t _mask; \
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\
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_mask = (a).e & scalar_mul2_consts.msb; \
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_mask = (_mask << 1) - (_mask >> 7); \
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(a).e = ((a).e << 1) & scalar_mul2_consts.mask; \
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(a).e = (a).e ^ (_mask & scalar_mul2_consts.mod); \
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}
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#define MUL4(a) \
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{ \
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MUL2(a); \
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MUL2(a); \
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}
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#define MUL(c, a) \
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{ \
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const uint8_t *mul_lt = vdev_raidz_mul_lt[c]; \
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switch (ELEM_SIZE) { \
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case 8: \
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a.b[7] = mul_lt[a.b[7]]; \
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a.b[6] = mul_lt[a.b[6]]; \
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a.b[5] = mul_lt[a.b[5]]; \
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a.b[4] = mul_lt[a.b[4]]; \
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case 4: \
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a.b[3] = mul_lt[a.b[3]]; \
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a.b[2] = mul_lt[a.b[2]]; \
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a.b[1] = mul_lt[a.b[1]]; \
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a.b[0] = mul_lt[a.b[0]]; \
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break; \
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} \
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}
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#define raidz_math_begin() {}
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#define raidz_math_end() {}
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#define GEN_P_DEFINE() v_t p0
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#define GEN_P_STRIDE 1
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#define GEN_P_P p0
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#define GEN_PQ_DEFINE() v_t d0, p0, q0
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#define GEN_PQ_STRIDE 1
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#define GEN_PQ_D d0
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#define GEN_PQ_P p0
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#define GEN_PQ_Q q0
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#define GEN_PQR_DEFINE() v_t d0, p0, q0, r0
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#define GEN_PQR_STRIDE 1
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#define GEN_PQR_D d0
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#define GEN_PQR_P p0
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#define GEN_PQR_Q q0
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#define GEN_PQR_R r0
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#define REC_P_DEFINE() v_t x0
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#define REC_P_STRIDE 1
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#define REC_P_X x0
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#define REC_Q_DEFINE() v_t x0
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#define REC_Q_STRIDE 1
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#define REC_Q_X x0
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#define REC_R_DEFINE() v_t x0
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#define REC_R_STRIDE 1
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#define REC_R_X x0
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#define REC_PQ_DEFINE() v_t x0, y0, d0
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#define REC_PQ_STRIDE 1
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#define REC_PQ_X x0
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#define REC_PQ_Y y0
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#define REC_PQ_D d0
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#define REC_PR_DEFINE() v_t x0, y0, d0
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#define REC_PR_STRIDE 1
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#define REC_PR_X x0
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#define REC_PR_Y y0
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#define REC_PR_D d0
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#define REC_QR_DEFINE() v_t x0, y0, d0
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#define REC_QR_STRIDE 1
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#define REC_QR_X x0
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#define REC_QR_Y y0
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#define REC_QR_D d0
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#define REC_PQR_DEFINE() v_t x0, y0, z0, d0, t0
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#define REC_PQR_STRIDE 1
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#define REC_PQR_X x0
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#define REC_PQR_Y y0
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#define REC_PQR_Z z0
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#define REC_PQR_D d0
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#define REC_PQR_XS d0
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#define REC_PQR_YS t0
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#include "vdev_raidz_math_impl.h"
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/*
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* If compiled with -O0, gcc doesn't do any stack frame coalescing
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* and -Wframe-larger-than=1024 is triggered in debug mode.
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* Starting with gcc 4.8, new opt level -Og is introduced for debugging, which
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* does not trigger this warning.
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*/
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#pragma GCC diagnostic ignored "-Wframe-larger-than="
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DEFINE_GEN_METHODS(scalar);
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DEFINE_REC_METHODS(scalar);
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boolean_t
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raidz_will_scalar_work(void)
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{
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return (B_TRUE); /* always */
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}
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const raidz_impl_ops_t vdev_raidz_scalar_impl = {
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.init = raidz_init_scalar,
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.fini = NULL,
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.gen = RAIDZ_GEN_METHODS(scalar),
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.rec = RAIDZ_REC_METHODS(scalar),
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.is_supported = &raidz_will_scalar_work,
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.name = "scalar"
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};
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/* Powers of 2 in the RAID-Z Galois field. */
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const uint8_t vdev_raidz_pow2[256] __attribute__((aligned(256))) = {
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0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80,
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0x1d, 0x3a, 0x74, 0xe8, 0xcd, 0x87, 0x13, 0x26,
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0x4c, 0x98, 0x2d, 0x5a, 0xb4, 0x75, 0xea, 0xc9,
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0x8f, 0x03, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0,
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0x9d, 0x27, 0x4e, 0x9c, 0x25, 0x4a, 0x94, 0x35,
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0x6a, 0xd4, 0xb5, 0x77, 0xee, 0xc1, 0x9f, 0x23,
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0x46, 0x8c, 0x05, 0x0a, 0x14, 0x28, 0x50, 0xa0,
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0x5d, 0xba, 0x69, 0xd2, 0xb9, 0x6f, 0xde, 0xa1,
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0x5f, 0xbe, 0x61, 0xc2, 0x99, 0x2f, 0x5e, 0xbc,
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0x65, 0xca, 0x89, 0x0f, 0x1e, 0x3c, 0x78, 0xf0,
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0xfd, 0xe7, 0xd3, 0xbb, 0x6b, 0xd6, 0xb1, 0x7f,
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0xfe, 0xe1, 0xdf, 0xa3, 0x5b, 0xb6, 0x71, 0xe2,
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0xd9, 0xaf, 0x43, 0x86, 0x11, 0x22, 0x44, 0x88,
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0x0d, 0x1a, 0x34, 0x68, 0xd0, 0xbd, 0x67, 0xce,
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0x81, 0x1f, 0x3e, 0x7c, 0xf8, 0xed, 0xc7, 0x93,
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0x3b, 0x76, 0xec, 0xc5, 0x97, 0x33, 0x66, 0xcc,
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0x85, 0x17, 0x2e, 0x5c, 0xb8, 0x6d, 0xda, 0xa9,
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0x4f, 0x9e, 0x21, 0x42, 0x84, 0x15, 0x2a, 0x54,
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0xa8, 0x4d, 0x9a, 0x29, 0x52, 0xa4, 0x55, 0xaa,
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0x49, 0x92, 0x39, 0x72, 0xe4, 0xd5, 0xb7, 0x73,
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0xe6, 0xd1, 0xbf, 0x63, 0xc6, 0x91, 0x3f, 0x7e,
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0xfc, 0xe5, 0xd7, 0xb3, 0x7b, 0xf6, 0xf1, 0xff,
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0xe3, 0xdb, 0xab, 0x4b, 0x96, 0x31, 0x62, 0xc4,
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0x95, 0x37, 0x6e, 0xdc, 0xa5, 0x57, 0xae, 0x41,
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0x82, 0x19, 0x32, 0x64, 0xc8, 0x8d, 0x07, 0x0e,
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0x1c, 0x38, 0x70, 0xe0, 0xdd, 0xa7, 0x53, 0xa6,
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0x51, 0xa2, 0x59, 0xb2, 0x79, 0xf2, 0xf9, 0xef,
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0xc3, 0x9b, 0x2b, 0x56, 0xac, 0x45, 0x8a, 0x09,
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0x12, 0x24, 0x48, 0x90, 0x3d, 0x7a, 0xf4, 0xf5,
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0xf7, 0xf3, 0xfb, 0xeb, 0xcb, 0x8b, 0x0b, 0x16,
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0x2c, 0x58, 0xb0, 0x7d, 0xfa, 0xe9, 0xcf, 0x83,
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0x1b, 0x36, 0x6c, 0xd8, 0xad, 0x47, 0x8e, 0x01
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};
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/* Logs of 2 in the RAID-Z Galois field. */
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const uint8_t vdev_raidz_log2[256] __attribute__((aligned(256))) = {
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0x00, 0x00, 0x01, 0x19, 0x02, 0x32, 0x1a, 0xc6,
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0x03, 0xdf, 0x33, 0xee, 0x1b, 0x68, 0xc7, 0x4b,
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0x04, 0x64, 0xe0, 0x0e, 0x34, 0x8d, 0xef, 0x81,
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0x1c, 0xc1, 0x69, 0xf8, 0xc8, 0x08, 0x4c, 0x71,
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0x05, 0x8a, 0x65, 0x2f, 0xe1, 0x24, 0x0f, 0x21,
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0x35, 0x93, 0x8e, 0xda, 0xf0, 0x12, 0x82, 0x45,
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0x1d, 0xb5, 0xc2, 0x7d, 0x6a, 0x27, 0xf9, 0xb9,
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0xc9, 0x9a, 0x09, 0x78, 0x4d, 0xe4, 0x72, 0xa6,
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0x06, 0xbf, 0x8b, 0x62, 0x66, 0xdd, 0x30, 0xfd,
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0xe2, 0x98, 0x25, 0xb3, 0x10, 0x91, 0x22, 0x88,
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0x36, 0xd0, 0x94, 0xce, 0x8f, 0x96, 0xdb, 0xbd,
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0xf1, 0xd2, 0x13, 0x5c, 0x83, 0x38, 0x46, 0x40,
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0x1e, 0x42, 0xb6, 0xa3, 0xc3, 0x48, 0x7e, 0x6e,
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0x6b, 0x3a, 0x28, 0x54, 0xfa, 0x85, 0xba, 0x3d,
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0xca, 0x5e, 0x9b, 0x9f, 0x0a, 0x15, 0x79, 0x2b,
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0x4e, 0xd4, 0xe5, 0xac, 0x73, 0xf3, 0xa7, 0x57,
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0x07, 0x70, 0xc0, 0xf7, 0x8c, 0x80, 0x63, 0x0d,
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0x67, 0x4a, 0xde, 0xed, 0x31, 0xc5, 0xfe, 0x18,
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0xe3, 0xa5, 0x99, 0x77, 0x26, 0xb8, 0xb4, 0x7c,
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0x11, 0x44, 0x92, 0xd9, 0x23, 0x20, 0x89, 0x2e,
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0x37, 0x3f, 0xd1, 0x5b, 0x95, 0xbc, 0xcf, 0xcd,
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0x90, 0x87, 0x97, 0xb2, 0xdc, 0xfc, 0xbe, 0x61,
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0xf2, 0x56, 0xd3, 0xab, 0x14, 0x2a, 0x5d, 0x9e,
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0x84, 0x3c, 0x39, 0x53, 0x47, 0x6d, 0x41, 0xa2,
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0x1f, 0x2d, 0x43, 0xd8, 0xb7, 0x7b, 0xa4, 0x76,
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0xc4, 0x17, 0x49, 0xec, 0x7f, 0x0c, 0x6f, 0xf6,
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0x6c, 0xa1, 0x3b, 0x52, 0x29, 0x9d, 0x55, 0xaa,
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0xfb, 0x60, 0x86, 0xb1, 0xbb, 0xcc, 0x3e, 0x5a,
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0xcb, 0x59, 0x5f, 0xb0, 0x9c, 0xa9, 0xa0, 0x51,
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0x0b, 0xf5, 0x16, 0xeb, 0x7a, 0x75, 0x2c, 0xd7,
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0x4f, 0xae, 0xd5, 0xe9, 0xe6, 0xe7, 0xad, 0xe8,
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0x74, 0xd6, 0xf4, 0xea, 0xa8, 0x50, 0x58, 0xaf,
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};
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